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Microchip Technology 1N4484US/TR
- Part No.:
- 1N4484US/TR
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- SQ-MELF, A
- Datasheet:
-
1N4484US/TR.pdf
- Description:
- DIODE ZENER 62V 1.5W D5A
- Quantity:
- Payment:
- Shipping:
Inventory:100
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Product details
Overview
1N4484US/TR from Microsemi is a hermetically sealed, voidless glass MELF (D-5A) surface-mount Zener diode rated for 1.5 W steady-state power dissipation, with nominal Zener voltage of 62.0 V at 4.0 mA test current, ±5% tolerance, and maximum dynamic impedance of 80 Ω at IZT. It operates across –65 °C to +175 °C junction temperature and is qualified to MIL-PRF-19500/406 at JANTXV level for high-reliability voltage regulation in aerospace power conditioning circuits.
For engineers reviewing the 1N4484US/TR datasheet, 1N4484US/TR pinout, 1N4484US/TR application, or 1N4484US/TR equivalent, this part delivers military-grade thermal stability, radiation hardness per MicroNote 050, ESD insensitivity per MIL-STD-750 Method 1020, and robust metallurgical bonding - critical for precision reference and overvoltage protection in avionics and satellite subsystems.
Technical Context
This Zener diode employs a Category I internal metallurgical bond and triple-layer passivation to ensure long-term stability under thermal cycling and radiation exposure. Its voidless hermetic glass construction eliminates moisture ingress and interfacial delamination risks common in epoxy-packaged alternatives.
The device exhibits a defined Zener knee at IZK = 0.25 mA with ZZK = 1500 Ω, enabling predictable low-current regulation. Thermal resistance from junction to end cap is 20 °C/W, supporting reliable 1.5 W operation at TA = 25 °C with derating above 75 °C per Figure 2.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 62.0 V at IZT = 4.0 mA - stable regulation point for mid-range high-voltage references. |
| Power Dissipation (PD) | 1.5 W @ TA = 25 °C - supports continuous regulation in compact, conduction-cooled layouts. |
| Dynamic Impedance (ZZT) | 80 Ω @ IZT - ensures <1% output variation under ±10 mA load transients. |
| Junction Temperature Range | –65 °C to +175 °C - enables deployment in extreme-environment flight control and downhole electronics. |
| Reverse Leakage (IR) | ≤0.25 µA @ VR = 49.6 V - minimizes standby current in battery-backed reference circuits. |
| Forward Voltage (VF) | 1.0 V @ 200 mA - allows use as clamping diode in bidirectional transient suppressors. |
| Tolerance | ±5% (no suffix) - standard grade for non-critical regulation where cost and qualification balance matter. |
Pinout & Package
Package: Hermetically sealed voidless glass MELF (D-5A) case with tungsten slugs; cathode indicated by single polarity band; terminals plated with Sn/Pb or RoHS-compliant matte tin (commercial only); weight: 193 mg.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal | Connected to lower-potential node in reverse-biased Zener configuration; accepts up to 1.5 A surge per 8.3 ms square wave. |
| Cathode | Zener breakdown terminal | Marked with band; connected to regulated output node; sustains 62 V reverse bias with <0.25 µA leakage at 80% VZ. |
Key Features
| Feature | Design Value |
|---|---|
| Voidless hermetic glass seal | Eliminates moisture-induced parameter drift and corrosion failure modes over 20+ year service life. |
| Category I metallurgical bond | Ensures mechanical integrity under shock/vibration >100 g and thermal cycling from –65 °C to +175 °C. |
| Triple-layer passivation | Prevents surface leakage paths and ion migration in high-humidity or contaminated environments. |
| MIL-PRF-19500/406 qualification | Validated screening includes burn-in, temperature cycling, and lot acceptance testing per JANTXV requirements. |
| Radiation hardness | Specified per Microsemi MicroNote 050 - suitable for total ionizing dose (TID) up to 100 krad(Si). |
Applications
| Aerospace Power Bus Regulation | Satellite Payload Reference Supply |
|---|---|
Use Scenario: Stabilizing 60–65 V intermediate bus in radiation-hardened DC-DC converters for attitude control systems. IC Role / Device Role / Timing Role: Primary voltage reference and overvoltage clamp in feedback loop of isolated flyback regulator. Use Value: Maintains ±0.5% output accuracy over –55 °C to +125 °C ambient with <10 ppm/°C tempco due to tight VZ binning and hermetic stability. |
Use Scenario: Providing precision bias for ADC front-end amplifiers in star tracker imaging subsystems. IC Role / Device Role / Timing Role: Low-noise, low-drift Zener reference replacing IC-based shunt regulators where latch-up immunity is mandatory. Use Value: Delivers <0.25 µA leakage at 49.6 V, reducing reference error contribution to <0.01% FS in 16-bit measurement chains. |
| Avionics Sensor Signal Conditioning | Downhole Telemetry Voltage Clamp |
Use Scenario: Biasing bridge sensors and compensating thermistor networks in engine monitoring units. IC Role / Device Role / Timing Role: Stable excitation source for Wheatstone bridges operating across wide temperature gradients. Use Value: Enables <±0.05% linearity error over full temperature range via matched thermal coefficient with platinum RTDs. |
Use Scenario: Protecting analog telemetry inputs from induced surges in oil/gas well logging tools exposed to 175 °C ambient. IC Role / Device Role / Timing Role: High-temperature transient voltage suppressor in 60 V sensor interface front-end. Use Value: Sustains 62 V regulation at +175 °C junction with <10% VZ shift - outperforming polymer-based TVS devices above 150 °C. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener voltage regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N4484US (non-TR) | Identical electrical specs and package; differs only in packaging format (bulk vs. tape-and-reel). | No functional difference; TR version supports automated SMT placement; bulk used for prototyping or manual assembly. | Select 1N4484US/TR when requiring EIA-481-B compliant tape-and-reel delivery for production line feeders. |
| SMF62A (ON Semiconductor) | Surface-mount SOD-123 package; 62 V, 1.0 W, ±5%; higher ZZT (150 Ω), wider tempco, no MIL qualification. | Limited to commercial industrial applications; unsuitable for radiation-exposed or mission-critical systems. | Choose SMF62A only for cost-sensitive, non-military designs where hermeticity and JANTXV screening are unnecessary. |
Compared with 1N4484US/TR, the non-TR variant offers identical performance but lacks automated placement compatibility, while SMF62A trades military reliability and thermal robustness for lower cost and smaller footprint - making it viable only in benign, short-lifecycle commercial systems.
Availability
1N4484US/TR is available at Aetrix Electronics and suitable for aerospace power regulation, satellite reference supply, avionics sensor biasing, and downhole telemetry requiring stable component supply across extended temperature and radiation environments.
Supply support for 1N4484US/TR includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Microsemi Corporation (now part of Microchip Technology) is a U.S.-based semiconductor company specializing in high-reliability, radiation-hardened, and military-qualified components for defense, aerospace, and industrial markets.
The 1N4460US–1N4496US series was designed specifically to replace legacy axial DO-41 Zeners in surface-mount high-reliability systems while maintaining MIL-PRF-19500/406 compliance and hermetic performance.
FAQ
What is the Zener voltage tolerance for 1N4484US/TR?
The 1N4484US/TR has a nominal Zener voltage of 62.0 V with a standard tolerance of ±5%, as indicated by the absence of a tolerance suffix (e.g., "C" for ±2% or "D" for ±1%). This tolerance applies at IZT = 4.0 mA and TA = 25 °C, and is verified per MIL-PRF-19500/406 screening for JANTXV-grade units. The 1N4484US/TR maintains this tolerance across its full operating temperature range due to hermetic construction and Category I bonding.
Is 1N4484US/TR RoHS compliant?
The 1N4484US/TR is available in both RoHS-compliant and non-RoHS versions. RoHS compliance is indicated by the "e3" suffix in the full part marking (e.g., 1N4484US/TR e3), and applies only to commercial-grade units - JANTXV and higher reliability levels retain Sn/Pb terminations per MIL specification. The RoHS version uses matte tin plating over copper, qualified to JEDEC J-STD-020 moisture sensitivity level 1.
What is the maximum surge current rating for 1N4484US/TR?
The 1N4484US/TR is rated for a non-repetitive peak Zener surge current (IZSM) of 0.23 A under an 8.3 ms square-wave pulse, as specified in the Electrical Characteristics table on page 3 of T4-LDS-0183-1. This rating assumes proper PCB thermal relief and is validated per MIL-STD-750 Method 2072. Exceeding this value risks irreversible junction damage even if average power remains within 1.5 W limits.
Does 1N4484US/TR require derating above 25 °C ambient?
Yes, the 1N4484US/TR requires linear power derating above 75 °C case temperature, as shown in Figure 2 of the datasheet. From 75 °C to 175 °C, PD decreases from 1.5 W to zero at a rate of 15 mW/°C. This derating is based on measured thermal resistance (RθJEC = 20 °C/W) and must be applied regardless of airflow or heatsinking, due to the end-cap thermal path limitation inherent in the MELF glass package.
How is polarity identified on the 1N4484US/TR package?
Polarity on the 1N4484US/TR is marked by a single cathode band located near one end of the cylindrical MELF glass body. The banded end is the cathode; the opposite end is the anode. This marking is laser-etched or inked per MIL-PRF-19500/406 requirements and remains legible after solder reflow (260 °C for 10 s). No additional markings (e.g., part number or date code) appear on the device body itself.
1N4484US/TR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- SQ-MELF, A
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Voltage - Zener (Nom) (Vz):
- 62 V
- Tolerance:
- ±5%
- Power - Max:
- 1.5 W
- Impedance (Max) (Zzt):
- 80 Ohms
- Current - Reverse Leakage @ Vr:
- 250 nA @ 49.6 V
- Voltage - Forward (Vf) (Max) @ If:
- 1.5 V @ 1 A
- Operating Temperature:
- -65°C ~ 175°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- D-5A
1N4484US/TR FAQ
1.How can I place an order for 1N4484US/TR through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N4484US/TR on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for 1N4484US/TR reliable?
The price and inventory of 1N4484US/TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N4484US/TR is usually 5 days.
3.What payment methods are accepted for 1N4484US/TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N4484US/TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N4484US/TR?
1N4484US/TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N4484US/TR order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for 1N4484US/TR?
For technical support, including 1N4484US/TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N4484US/TR requirements.
6.How does Aetrix verify that 1N4484US/TR is sourced from the original manufacturer or authorized distributors?
All 1N4484US/TR products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that 1N4484US/TR meets industry standards.
7.What is the process for return or replacement of 1N4484US/TR?
All 1N4484US/TR units undergo pre-shipment inspection (PSI). If there is an issue with 1N4484US/TR, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The 1N4484US/TR part is unused and in its original packaging.
Return procedure for 1N4484US/TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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